Hi hottielili,
If you haven't yet, please check out the following posts for a few iPhone supplier suggestions:
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With name brand items (ie. Apple products), often the only way to get authentic merchandise at wholesale prices is by applying with the company to become an authorized reseller. This scenario is not uncommon for branded products, as distribution channels are usually tightly controlled. One option is to try and contact Apple directly and ask for their authorized distributors, another is to inquire how you could become an authorized distributor yourself.
All the best!